Hello! I have a1998 Monaco diplomat with 35000 mile it has a Allison 3060 tranny. My problem is sometimes when I start it up the check trans light comes on and when it does it will not go into any gear. If I turn off the engine and restart it the light goes out and it will be ok . Sometimes while driving it will come on and I have to pull over shut the engine off and restart for the check engine light to go off? Help please!

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While traveling in '02 I had to have CoachNet tow my coach to an Allison shop, (Detroit Diesel in Bloomington, MN), to diagnose and correct an Allison M3060 "Do Not Shift" condition.
They found a bad 14 ga, wire, which is supposed provide 12VDC from the chassis battery to the Allison VIM, (Vehicle Interface Module).

After replacing only that 15' copper wire they attempted to charge me $2,400!
When I flatly refused to pay that ridiculous price they settled for only(?) $1,500.

Did I get a bargain or what?.........(It still feels like I got or what)!

I have uploaded the 2010 version of the Allison Shift Selector Manual (SA3360EN) to the Manuals section of the Files stored here. This explains how to use your shift selector to retrieve fault codes on 3000/4000 transmissions.